The classification of express packaging bags is divided into express plastic bags, express document seals, express bubble bags, express bone bags, express woven bags, etc. according to materials.

1. Express plastic bag material: low-density polyethylene (LDPE) usually referred to as PE, high-density polyethylene (HDPE) usually referred to as PO, express plastic bags have the advantages of low cost and light weight.

The difference between PE and PO in express plastic bags: PE has better transparency and softness, and the printing color is brighter; PO has relatively good mechanical properties; PE is used as the main material in domestic express bags, but it is generally used abroad. PE, PO complex cooperation as the main material of express bags.

There are two types of polyethylene express bags in the market: one is new material express bags, and the other is recycled material express bags

2. Courier document cover material: generally gray-bottomed white paper, white cardboard, cow cardboard, mostly. The express industry generally uses paper with a weight of 200 g/m2 to 450 g/m2. Compared with express plastic bags, express document seals have the advantages of being flat and not easily broken.

3. Express bubble bag material: a transparent flexible packaging bag filled with air in the middle layer of an air cushion film. It is mainly used for the packaging of small, fragile, fragile, and less precise goods in the express industry. The express bubble bag is equipped with a shock-absorbing bubble film. There are countless small bubbles in the bubble film, so it is light and elastic. It has good shock absorption, impact resistance, non-toxic, odorless, moisture-proof, and corrosion-resistant advantages.